Gas valve



April 6 1926.

P. A. M. HACKSTROH ET AL GAS VALVE Fi ld May 9. 1925 Inventors Pieterflugusl'us Mari/ms Hacks U01? and Otto van Kealen. oer mm 3 -M- .flffiome Patented Apr. 6,1926.

UNITED STATES PATENT OFFICE.

PIETER AUGUSTUS MARINUS HAGKSTROH, OF THE HAGUE, AND OTTO VAN KEULEN, OF HAARLEMMER MEER,- NETHERLANDS.

GAS VALVE.

Application filed May 9, 1925. Serial No. 29,122.

To all whom it may concern Be it known that we, Pm'rnn AUGUSTUS MARINUS HAcKs'rnou and O'r'ro VAN" KEULEN, both subjects of the Queen of the Netherlands, residing at Berberisstraat 54, The Hague, and Aalsmeerderweg 89, Ilaarlemmer Meer, the Netherlands, respectively, have invented certain new and useful Improvements in and Relating to Gas Valves, of which the following is a specification.

The present invention relates to an apparatus for automatically interrupting the gas supply to a gas burner should the gas not be lighted or after lighting be extenguished, due to decrease or failure of pressure in the main supply pipe, rupture or loosening of the flexible gas tube, treading upon the gas tube, boiling over of water, etc.

The present invention has for its object to avoid accidents and gas losses. The apparatus is so constructed that after wholly or partially opening a main gas valve the gas supply to the burner is obtained without further manipulations being necessary, and the operation of the apparatus is such that, only during a very short time can unburnt gas escape and, when once the gas has been lighted, the gas supply is not interrupted.

In order to obtain this result it is necessary that:

(1) The gas flows out upon wholly or partially opening the main gas valve of the apparatus without any other manipulations;

(2) Upon lighting of the gas the outflow of gas is continued;

(3) Should the gas not be lighted the outflow of gas is automatically prevented after a short time;

(4) Should the gas flame be extinguished, due to a temporary stoppage of the gas supply or to draught or otherwise, the outflow of gas is'automatically interrupted.

According to the invention the apparatus comprises a main gas valve connected to a casing having an auxiliary gas valve, comprising an appliance provided with a closure means for a gas outlet of the casing and operable by the main gas valve. and having means actuable by the heat of the gas flame for preventing the gas outlet being closed should the gas be lighted, the said auxiliary gas valve being so constructed and mounted that upon opening the main gas valve, wholly or partially the closure means comes into the closing position after a short time, while upon closing the main gas valve, the auxiliary gas valve comes immediately into the original position. The auxiliary gas valve may comprise a pair of containers or tanks adapted to be rocked about an axis and to contain an actuating medium, such as a liquid or granulated mass, which containers are connected to each other by pipes of dissimilar diameter, so that during and after the rocking motion of the containers the actuating medium will flow more slowly from the one container into the other than reversely. This constitutes an important feature as otherwise, after opening again the main gas valve, the apparatus could not be used for the reason that the appliance would again move to the position for closing the gas outlet and the gas supply to the burner be cut off.

The above and other characteristics of the invention will be more fully described and explained hereinafter with reference to the accompanying drawings illustrating an embodiment of the invention by way of example.

In the drawing showing a section of the said embodiment 1 is the pipe for the supply of gas to the apparatus. 2 is the main gas valve (gas cock). 3 is an arm connected to the plug of the main gas valve, which arm, when the gas valve 2 is turned, engages the auxiliary gas valve 4 and causes that valve to make a rotary movement, about a shaft 5. The auxiliary valve 4 comprises at one side of the shaft 5 a closed container 6 and atthc other side a similar container 7. which containers serve to receive a liquid or a granulated mass. The. containers are connected to each other by a wide pipe 8 and a narrow pipe 9, while an air pipe 10 connects the air spaces of the containers. 11 is a closing plug connected to the container 6 and adapted to close the opening 12 of a pipe 13 for the outlet of the gas from a casing containing the tanks and accessories, to a gas burner. 14 is a box provided with a diaphragm 15 adapted to change its shape by temperature alterations. 16 is a pin centrally and perpendicularly secured to the diaphragm 15 and adapted to prevent the closing plug 11 from turning so far that it closes the opening 12. 17 is a tube entering into the box 14 and leading to the burner where it is closed. I

The operation of the apparatus is as follows: I

The main gas valve 2 bemg closed, then the arm 3 occupies a position, in which the tained therein flows slowly down the narrow pipe 9 into the tank 7, so that this tank grows heavier and finally is lowered, until the closing plug 11 closes the opening 12, whereby the gas supply to the burner is out off. However, if, before this closing operation is finished, the gas is lighted, then the gas flame heats the air in the tube 17 and. in the box 14, and this air expands and forces the diaphragm 15 outwardly and the pin 16 is moved into such a position, that the closing plug 11 cannot turn far enough to close the opening 12.

If, thereupon the gas flame is extinguished for some reason, then the pin 16 returns to its former (retracted) position and consequently the auxiliary valve is free to turn further and the closing plug 11 closes the opening 12.

If the main gas valve 2 is closed again, then the arm 3 raises the container 7 to such an extent, that the liquid or granulated mass contained in the container 7 rapidly flows down the wide pipe 8 into the tank 6. It follows from the above that the connection between the containers 6 and 7 is of such a nature that, if the container 6 owing to the closing of the main gas valve 2 has automatically reassumed its lower position in which the liquid or granulated mass commences its flow througlrthe pipe 8, the said liquid or granulated mass flows very rapidly into the container 6. In this manner, when reopening the main gas valve, the apparatus is not made inoperative, since the container 6 has no opportunity of moving back into its highest position whereby the gas supply to the burner would be cut oil.

Consequently the result is that the apparatus according to the present invention is not only operative when opening the main gas valve partially or wholly, but also immediately upon having closed and reopened the main gas valve. 1

It will be clear that if the device which changes its shape under the influence of the heat generated by the flame, is located at some distance from the flame (i. e. if the invention is applied to a gas stove, connected by a flexible rubber tubeto the gas supply pipe) it should be connected by a pipe, iod or small flexible tube or otherwise to the burner. The said pipe, rod or the like, might be omitted, however, if the flame is formed at such a small distance from the said device that the heat of the flame may directly influence the said device.

Having now particularly described. and ascertained the nature of our said invention and the manner in which the same is to be performed, what we claim as new and desire to secure by Letters Patent is:

1. Apparatus for automatically interrupting the gas supply to a gas burner should the gas not be lighted or after lighting be extinguished,.comprising a casing, a main gas valve connected to the casing, an auxiliary gas valve enclosed within the casing and comprising an appliance having a 010- sure means for a gas outlet of the casing and operable by the main gas valve, and means actuable by the heat of the gas flame for preventing the closing of the said outlet, the said auxiliary gas valve being adapted to be rocked about an axis and comprisingtwo containers, each adapted to receive an actuating medium, the containers being connected to each other in such a manner, that during and after ,the rocking motion of the containers, the medium willflow more slowly from the one container than from the other,

2. Apparatus for automatically interrupting the gas supply to a gas burner should the gas -not be lighted or after lighting be extinguished, comprising a casing, a mam .gas valve connected to the casing, an auxiliary gas valve enclosed within the casing and comprising an appliance havlng a closure means for a gas outlet of the casing and operable by the main gas valve, and means actuable by the heat of the gas flame for preventing the closing of said outlet, the said auxiliary gas valve being adapted to be rocked about an axis and comprising two containers each adapted to receive an actuating medium and pipes of dissimilar diameter connecting the said containers together.

3. Apparatus for automatically interruptin the gas supply to a gas burner should the gas not be lighted or after lighting be extinguished comprising a casing, a main gas valve connected to the casing, an arm connected to the plug of the main gas valve and projecting into the said casing, an auxiliary gas valve comprising a pair of containers adapted to receive an actuating medium, provided with a closure means for a gas outlet of the casing, and mounted for a rocking movement within the casing, pipes of dissimilar diameter connecting the said containers and operable by the arm of the main gas valve, a thermostatic device actuable by the heat'of the gas flame, being provided within the casing and ada ted to stop the outlet closing movement of t e containers should the gas be lighted.

4. Apparatus for automatically interrupt-.

ing the gas supply to a gas burner should the gas not be lighted or after lighting be extinguished, comprising a. casing, a. main as valve connected to the casing, an auxiliary gas valve enclosed within the said casing and comprising-an apliance having a closure means for a gas out et of the casing 1 and operable by the main gas valve, and

let from being closed, the said thermostatic means comprising a box containing a diaphragm, adapted to cooperate with the closure means for the gas outlet, and a member carried on the diaphragm and projected into the path of the closure means for the gas outletof the casing, for preventing this outlet from being closed should the gas be lighted and remain lighted for a predetermined time.

In testimony whereof we affix our signatures.

PIETER AUGUSTUS MARINUS' HACKSTROH.

OTTO m KEULEN. 

